JPH0838397A - Electric cleaner - Google Patents

Abstract

PURPOSE:To provide an electric cleaner by which the motor service life of a least condition is satisfied as the electric cleaner and a sucking power (sucking force) is improved. CONSTITUTION:This electric cleaner to generate the sucking force by the driving of a fan is provided with a battery 7, orthogonal transforming means 13 for transforming a DC output from this battery 7 to an AC output, and an AC rectifier motor 6 for driving the fan corresponding to the AC output from this orthogonal transforming means 13.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a vacuum cleaner.

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Patent Publication No. 5-76290, a portable electric vacuum cleaner comprising a battery and a DC motor for driving a fan by the DC output from the battery. Used a DC motor as small as possible with an emphasis on portability.

In order to obtain the maximum suction work rate [W] (= suction force) with a small DC motor, the DC motor is driven at the maximum current within the allowable service life. Was there.

[0004]

Here, the life of a DC motor having a commutator or a motor completed in an AC commutator motor is determined by the following formula: ) And the motor current value, the following equation is obtained.

Motor life = A / [(suction work rate) × (current value)] Formula A: Proportional constant Then, in an electric vacuum cleaner using a DC motor,
As described above, the maximum current is used within the allowable life range, and if the current is increased as shown in the formula, the motor life becomes short and the minimum life as an electric vacuum cleaner cannot be maintained. Therefore, it is impossible to increase the current value and increase the suction power.

The present invention has been made to solve the above problems, and an object thereof is to provide an electric vacuum cleaner having a minimum motor life as an electric vacuum cleaner and a large suction work rate. And

[0007]

The electric vacuum cleaner of the present invention comprises:
A suction power is generated by driving a fan, a battery, an orthogonal conversion unit that converts a DC output from the battery into an AC, and an AC commutator motor that drives the fan by the AC output from the orthogonal conversion unit. -Is provided.

[0008]

According to the present invention, by using the AC commutator motor, the life of the DC motor having the commutator is about the same, but the suction power is large.

[0009]

EXAMPLES Examples of the present invention will be described below. First, the structure of the present invention will be described with reference to FIGS. 1-2, and then the electric circuit will be described with reference to FIG. It is explained that the suction work rate increases while the values are about the same.

FIG. 1 shows an electric vacuum cleaner of the present embodiment, in which 1 is a main body, 2 is an openable / closable lid, and inside this lid 2 is a dust collecting recess having a filter device (not shown). 3 is provided. Reference numeral 4 denotes a handle located at the front end of the main body 1 and communicating with the dust collecting recess 3 and reference numeral 5 denotes a handle located above the rear portion of the main body 1.

Inside the main body 1, 6 is an AC commutator motor for driving the fan 6a, 7 is a rechargeable battery such as nickel-cadmium battery, and 8 is an operating knob 8a provided on the upper surface of the handle 5. It is a slide switch.
The operation knob 8a slides to the “a” position, the “b” position, and the “c” position as shown in FIG. 2, and the electrical component board installed inside the main body 1 according to each position as described later. Control an electric circuit (not shown). An outlet 9 is connected to a commercial power source to receive power supply.

FIG. 3 shows an electric circuit diagram of this embodiment.
Is a transformer for stepping down the voltage from the commercial power source via the outlet 9, and a rectifying diode 11 and the rechargeable battery 7 are connected in series between the positive and negative lines on the secondary side of the transformer 10. It is connected. Further, the switch 12 and the orthogonal conversion means 13 are connected in series between the connection point between the rectifying diode 11 and the rechargeable battery 7 and the negative line.

Reference numeral 6 is the AC commutator motor, and 8 is the slide switch having the operating knob 8a.
The slide switch 8 has a fixed contact 14a connected to the primary side of the transformer 10, a fixed contact 14b connected to the outlet 9, a fixed contact 14c connected to the AC commutator motor 6, and an output of the orthogonal transformation means 13. It has a fixed contact 14d connected to the side, and by sliding the operating knob 8a, two adjacent fixed contacts of the fixed contacts 14a to 14d can be electrically connected.

Next, the operation of the electric vacuum cleaner of the present invention will be described. The "a" position of the operating knob 8a indicates the charging state,
At the "a" position, commercial power is applied to the transformer 10 by connecting the fixed contacts 14a and 14b,
The output from the transformer 10 is rectified by the rectifying diode 11 to charge the rechargeable battery 7.

The "b" position of the operating knob 8a shows a state in which the AC commutator motor 6 is directly driven by a commercial power source, and the fixed contacts 14b, 14c are connected at the "c" position, so that the commercial Power is directly applied to and drives the AC commutator motor 6.

The "c" position of the operating knob 8a shows a state in which the AC commutator motor 6 is driven by using the rechargeable battery 7 as a power source. At the "c" position, the fixed contacts 14c, 14d are provided.
Is connected and the switch 12 is turned on in conjunction with this.
N is done. Therefore, the DC output from the rechargeable battery 7 is converted into AC by the orthogonal conversion means 13 and at the same time 100V.
Is boosted and is supplied to the AC commutator motor 6.

Next, it will be explained that by using the AC commutator motor in the present invention, the suction power is increased while the life is about the same as that of the DC motor.

The proportional constant A in the equation has a similar value in a DC motor and an AC commutator motor having the same commutator structure and core structure. here,
When using a DC / AC commutator motor having the same minimum motor life as an electric vacuum cleaner, the following relationship is satisfied from the equation.

Motor life = A / [(DC suction power) × (DC current value)] = A / [(AC suction power) × (AC current value)] ..

[(DC suction work power) × (DC current value)] ─── Expression = [(AC suction work power) × (AC current value)] ── Expression Here, rechargeable battery As an example, when 10 nickel-cadmium batteries having a rated voltage of DC 1.2 V and a capacity of 2.0 Ah are used, the discharge efficiency is 85%, and the DC motor used in this example has a usage time of 10 minutes. Further, the conversion efficiency from the motor power consumption to the suction power is 30%.

Therefore, when a DC motor having a commutator is used, the suction work power has the following value.

(In the case of a DC motor) Voltage: 1.2V × 10 lines = 12V Current: 2.0Ah × 0.85 × 60 minutes / 10 minutes = 10.2A Equation: Power consumption: 10.2A × 12V = 122.4W Suction work power: 122.4W × 0.3 = 36.7W Substitute each value into the formula.

Formula = 36.7 W × 10.2 A = 374.5 WA Further, when the same rechargeable battery is used as a power source and an AC commutator motor driven at 100 V is used, as described above, Formula = Formula = 374. Since it is 5WA, the formula is as follows. (The AC current value is I.) (For AC commutator motor) Formula = 0.3 × 100V × I × I = 374.5 I = 3.5A Power consumption: 3.5A × 100V = 350W ─── Formula Suction work rate: 350W × 0.3 = 105W Therefore, the obtained AC suction work rate is 2.9 times (105W (AC suction work rate) /
It becomes 36.7 W (DC suction power) = 2.9). That is, a strong suction force of 2.9 times can be obtained.

As described above, a strong attracting force can be obtained by using an AC motor, but on the other hand, a disadvantage is that energy loss occurs because an inverter circuit is used as the orthogonal transformation means. In addition, since it has a large AC suction work rate, the operating time of a continuous motor is shortened. Here, when the energy conversion efficiency of the inverter circuit as the orthogonal transformation means is 80%, the continuous use time of the motor is as follows.

Formula = (Battery output power) × 0.8 = 350 W (Battery output power) = 437.5 W (Battery output current) = 437.5 W / 12 V = 36.5 A Referring to the battery output current represented by the formula, , Use time X
If it is minutes, the usage time X minutes is as follows.

(Battery output current) = 2.0 Ah × 0.85
× 60 / X = 36.5A X = 2.8 minutes Therefore, the usage time of the obtained AC commutator motor is 0.28 times (2.8 minutes) the usage time of the DC motor.
(Use time of AC commutator motor) / 10 minutes (use time of DC motor) = 0.28).

In the above-mentioned embodiment, when comparing the vacuum cleaners using the DC and AC commutator motors having the same life, the AC commutator motor is used, so that the suction power (= suction force) is increased. Is 2.9 times, which is sufficiently useful even considering the disadvantage that the use time is shortened to 0.28 times by using the AC commutator motor.

[0028]

As described above, according to the present invention, by using the AC commutator motor, the life is about the same as that of the AC commutator motor, and the DC motor having the commutator is used. A large suction power (= suction force) can be obtained as compared with the suction power (= suction force) of the DC motor.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a slide switch 8 in FIG.

FIG. 3 is an electric circuit diagram of an embodiment of the present invention.

[Explanation of symbols]

 7 Battery 6 AC commutator motor 6a Fan 13 Orthogonal conversion means

Claims (1)

[Claims] 1. An electric vacuum cleaner that generates a suction force by driving a fan, comprising: a battery, an orthogonal conversion unit that converts a DC output from the battery into an AC, and an AC output from the orthogonal conversion unit. An electric vacuum cleaner, comprising: an AC commutator motor for driving a fan.